I have removed the old bathroom floor and have removed the toilet. I plan to install 3/8" tile over 1/2" cement backer board. The closet flange is attached to the plywood subfloor, so I guess there will be a distance of about an inch between the flange and the finished floor. What is my best approach to this problem? I have seen the two wax rings method discussed and UltraSeal as well, but no comment on experience with the later. I was wondering if this is a good product, or if I should stay with the traditional methods. Or is there a better solution? Thanks.